Buying Guide
Smart TRV vs Manual TRV — Is the Upgrade Worth It? UK Guide
Updated July 2026
Every radiator in your home probably has a manual TRV — that numbered dial you turn from 1 to 5. A smart TRV replaces it with a motorised valve controlled from your phone. The promise: save 15–25% on heating by only warming rooms you use. The cost: £30–60 per valve. Is it worth the upgrade? Here's the honest answer.
Quick answer
Our top pick: tado° Smart TRV (starter set)
~£200 for a 3-bed on Amazon
For a 3-bed UK house with 4 main radiators: smart TRVs cost approximately £200 to install (DIY, 5 minutes per valve), save approximately £150–225 per year on gas, and pay for themselves within 12–18 months. After that, every pound saved is pure profit.
Check Price on Amazon →Manual TRV vs Smart TRV compared
| Feature | Manual TRV | Smart TRV |
|---|---|---|
| Price | £5–10 | £30–60 |
| Control | Turn dial manually | App, voice, schedule |
| Scheduling | None | Per-room, per-day |
| Geofencing | No | Yes (turns off when you leave) |
| Room-by-room | Manual adjustment needed | Automatic |
| Savings | Basic | 15–25% on heating bills |
| Installation | Plumber usually | DIY 5 minutes |
| Battery | None needed | AA batteries, 1–2 years |
How smart TRVs save money
Room-by-room scheduling is where the savings come from. A manual TRV is either open or closed — you have to remember to turn each one down when you leave the room. A smart TRV runs on a schedule you set once, then forgets. Heat the bedroom 7–8am and 10pm–midnight only. Heat the living room 6–11pm only. Kitchen and bathroom on demand. Spare bedroom off unless guests are staying.
Geofencing uses your phone's location to detect when the last person leaves the house. The TRVs drop to a frost-protect setback until someone heads home, then warm up so the house is comfortable on arrival. No wasted heating for an empty house.
Open-window detection senses a sudden temperature drop and pauses the radiator for 15–30 minutes. Kills the classic "windows open, boiler blasting" waste when you air a room.
Full breakdown: Smart TRV running costs & real savings →
Best smart TRVs for UK homes
tado° Smart Radiator Thermostat
The most refined smart TRV on the UK market. Setup is genuinely 5 minutes per valve, the app is unusually good, and the geofencing works reliably. Priced accordingly.
Pros
- Best-in-class app with schedules and geofencing
- Works with any UK boiler
- Open-window detection built in
- Voice control (Alexa, Google, HomeKit)
Cons
- Requires the tado° Bridge
- Optional Auto-Assist subscription for geofencing
Who it's for: Households that want the polished all-in-one system with real geofencing
Check Price on Amazon UK →TP-Link Kasa KE100
The best price per valve of any major brand. Not as polished as tado° but does the important things — schedules, remote control, open-window detection — for half the price.
Pros
- Cheapest big-brand smart TRV
- Kasa app is simple and free — no subscription
- Works with existing TP-Link kit
- Local schedules run without the internet
Cons
- Requires the KH100 hub
- No native HomeKit support
Who it's for: Whole-house smart TRV rollouts on a budget
Check Price on Amazon UK →SONOFF TRVZB
Ideal for the DIY smart home crowd. If you already run Zigbee, the TRVZB is by far the cheapest per-radiator route to full smart heating control.
Pros
- Cheapest Zigbee smart TRV
- Works with Home Assistant, SmartThings, Zigbee2MQTT
- No subscription, no vendor lock-in
Cons
- Needs a Zigbee hub you already own
- Setup is not beginner-friendly
Who it's for: Home Assistant / Zigbee users who want to integrate radiator valves into an existing smart home
Check Price on Amazon UK →All 5 smart TRVs reviewed: Best Smart Radiator Valves UK →
When smart TRVs are NOT worth it
- You only heat one room anyway (bedsits, small flats)
- You already turn radiators off manually and don't forget
- Your boiler is very old — upgrade the boiler first, then TRVs
- You rent short-term and can't justify the cost for one winter
The savings come from heating fewer rooms less often. If you already do that with manual valves, smart TRVs add convenience, not much money.
How to install a smart TRV
- Turn off the heating and let the radiator cool. No need to drain the system.
- Unscrew the old TRV head by hand. The plastic collar unthreads — pin valve stays in the radiator.
- Screw on the smart TRV using the correct adapter (M30, Danfoss RA, or Caleffi — all included in the box).
- Download the app and follow the pairing wizard. Batteries in, hub connected, valve calibrates itself.
- Set schedules. Done in 30 minutes for 4 valves.
Which one should you buy?
We recommend
Best all-round: tado°
Pay more for the setup that just works — app, geofencing, boiler control, and open-window detection out of the box. Best for households who won't tweak settings after install.
Tip
Best value: TP-Link Kasa KE100
Half the price of tado° with 80% of the features and no subscription. The right choice if you're kitting out 4+ radiators.
Frequently asked questions
Bundle
Smart TRV Starter Kit — Budget or premium
- Budget: TP-Link KE100 × 4 + KH100 hub~£160Amazon →
- Premium: tado° starter + 3 extra valves~£220Amazon →